Finding the Fourth Proportional to 1,086.37, 1,498.64 and 687.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.37 : 1,498.64 = 687.36 : x
2. Step 2: Convert to fraction form
   1,086.37/1,498.64 = 687.36/x
3. Step 3: Cross multiply
   1,086.37x = 1,498.64 × 687.36
4. Step 4: Simplify right side
   1,086.37x = 1,030,114.14
5. Step 5: Solve for x
   x = 1,030,114.14/1,086.37
6. Step 6: Final answer
   x = 948.21